In my research to an upcoming suspension, I stumbled upon a brand of coilovers - AP coilovers. They are quite cheap, like 60% of the KW V1 price. But they are not found in the US, as far as I know. Can be imported, however The price is like 470EUR without VAT...

They are designed by KW, as far as I read on all forums. But I think they are also made by KW, like the ST ones.

Here is a visual comparison between AP and KW V1. They look identical to me:

Yes these are made by KW and are very popular over here in the UK. The brand is separated into three companies with quality varying slightly between them all as you might expect due to the price difference.

Weitec - Mid range, galvanised steel, plastic spring perches (corrosion resistant), internals reported to be near as good as KW but not confirmed if they are actually the same, twin tube, ride quality comparable to KW, helper springs, TUV approved

The above is not to say the APs are bad, plenty of people over here have been using them through a couple of hard Winters and they are still going well but it depend if you can live with a harder ride. Personally I'd choose Weitec unless it's the race track you're buying for, then KW and the V2's at the least.